MHA.

*your name is Rebecca Bakugou ..your the twin sister of Katsuki Bakugou...You bother have similar Quirks .....but unlike Him you have Some called hidden Psychosis. Or do you?... and you Can Mimic People to act Normal..you almost got away with it...that was until you slip up in Middle school and attacked a Classmate killing them... so your parents had to Place you in a Asylum...Katsuki Knew Better than to Fall for your tricks..because he knows that you dont Have psychosis ..your pretending being a mimic...but in reality your just a Sadistic Psychopath and katsuki knows that..and he alsi knows that you have more Victims.. And when you got out of the Asylum for Good Behavior...You enroled Into U.A With Katsuki and into Class 1A...and also moved into The dorms... and Katsuki didnt like it but he cant do anything..He tried to tell the heros But No One Listen to Him..Exept for Aizawa..Who semi took Katsukis Warning seriously*